WOBIB: 81 - Bundesen, et al. (2002) Attentional effects ...
 
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Claus Bundesen; Axel Larsen; Soren Kyllingsbaek; Olaf B. Paulson; Ian Law. Attentional effects in the visual pathways: a whole-brain PET study. Experimental Brain Research 147(3):394-406, 2002. PMID: 12428147. DOI: 10.1007/s00221-002-1243-1. WOBIB: 81.

Attentional effects in the visual pathways were investigated by contrasting the distribution of regional cerebral blood flow (rCBF) measured by H(2)(15)O positron emission tomography (PET) during performance of a shape-matching task with the distribution of rCBF during a less demanding color-matching task. The two tasks were performed using the same stimuli: pairs of colored random shapes shown at a fixed rate (2 s per pair). In the shape-matching task, the subjects determined whether the two stimuli were the same in shape regardless of differences in size or color. In the color-matching task, the subjects determined whether the two stimuli were the same in color regardless of differences in size or shape. Mean reaction time for shape-matching exceeded mean reaction time for color-matching by nearly 200 ms. The corresponding shape-color comparison showed extensive bilateral increases in rCBF in visual areas in the occipital and parietal lobes, including the primary visual cortex. Subcortical activations were found in cerebellum (particularly the vermis) and in the thalamus with the focus in a region comprising the lateral geniculate nucleus, the pulvinar, and adjacent parts of the reticular nucleus. Frontal activations were found in a region that seems implicated in visual short-term memory (posterior parts of the superior sulcus and the middle gyrus). The reverse, color-shape comparison showed bilateral increases in rCBF in the anterior cingulate gyri, superior frontal gyri, and superior and middle temporal gyri. The attentional effects found by the shape-color comparison in the thalamus and the primary visual cortex may have been generated by feedback signals preserving visual representations of selected stimuli in short-term memory.

Asymmetry: -0.30996 (left: -1, right: +1)

VRML2 file (110 Kb)

1 Free-viewing versus fixation. Free-viewing during color minus shape matching task versus fixation during task. WOEXP: 252.
2 Shape matching. Shape matching with colored random polygons presented serially in pairs on a screen with response by left or right mouse button press versus color matching. WOEXP: 253.
3 Color matching. Color matching with colored random polygons presented serially in pairs on a screen with response by left or right mouse button press versus color matching. WOEXP: 254.
4 Difficult color matching. Difficult color matching with low discriminable colored random polygons presented serially in pairs on a screen with response on a right or left hand mouse button versus easy color matching. WOEXP: 255.


corner cube of WOBIB_81

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